The perpendicular rhombs described above in connection withthe Coupler and rhombic dodecahedron are given animated treatment as a part of a multi-part Youtube series. Director: K. Urner Screenwriter: D. Koski.

In this series, the idea of a Rhombic Book, two triangularbook covers symmetrical about a spine, and a page flappingback and forth, another below at 180 degrees (optional), isused to introduce three tetrahedrons:

(a) the one comprised of a left book cover and the page(b) the one comprised of a right book cover and the page(c) an "inadvertent one" comprised of the two varying lengths at 90 degrees and opposite one another, other lengths same as rhomb's.

(a) + (b) + (c) assemble a topological IVM in a way described in the vids.

Also (a), (b) and (c) are all of same volume as one another, though as the page revolves they cycle through a minimum / maximum.

These concepts help reinforce / anchor some of the other animations and demos we've been touring.